The only and rare Technics components, this picture show ......
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My principal systems
SL-1000 MK3D, DD DIRECT DRIVE TUNRTABLE
Technics went even a step further in designing the perfect turntable. In 1981 the SP-10 Mk 3 was introduced. It had a platter consisting of a copper alloy inner section and an aluminum outer part, weighing a mere 10 kg = 22 lb. and the complex electronic circuitry to regulate the speeds and constancy of the rotation of this heavy platter. The total unit itself weighs 18 kg (=40 lbs). This machine was not sold in great quantities because digital media were emerging on the horizon and few owners of an SP-10 mk2 saw the need of switching to this newer version of turntable. In hindsight they may regret it.
The advantage of the Mk3 is not only the practically unmeasurable wow and flutter, but the fact that now all speeds can be adjusted in 0.1% steps to +/-9 % which makes this unit ideal, also for transfers of all records including all sorts of shellac records. Note: if you look carefully you can see that the SP-10 Mk3 has a softer turntable mat (at least in the picture) compared to the mat on the SP10Mk2 which is harder.
The newer generation of Technics turntables introduced at the end of the nineteen seventies/beginning of the nineteen eighties do no longer have a closed motor compartment. Now the stator with the green coils (core) is solid with the plinth/chassis. The bearing housing of the spindle is fixed in the center. The supporting disc on top of the spindle is actually very small. This "simpler" method of construction was applied in the Technics SP-10Mk3 design and later found in the cheaper models like SL 1810 and SL 1310, the 10 referring to the SP-10.
At left the underside of the heavy platter. Much of the weight is of the large ring with magnets: the rotor. The mass is not concentrated at the periphery of the platter as would be the case with heavy belt drive designs. Not in the SP-10 Mk3 because that would slow the starting and stopping time of the platter. It is obvious that care has to be taken to prevent dust to settle in the stator and rotor. Check and clean with compressed air from a can (Dust-Off) or use a hair blower set to cold. Then you can put the platter back again.
The turntable has a starting torque of 16kg/cm-2, nearly three times the value of the SP-10 mk2.
The rotor and stator of the SL 1810 are of course less sturdy and quite small if compared to the large and heavy rotor and stator of the magnificent SP-10 Mkiii. The electronics of the simpler turntable match of course this small motor with light platter and do not differ much from the design of the later SP-15 and SP-25.
The technicians of Technics designed a special base for the SP10 mk2 which was also used for the SP10 mk3. It was made of obsidian (volcanic glass) which had a nice shape and was beautifully polished.
3 WAY LINEAR PHASE SPEAKERS SYSTEM
TECHNICS SE-A3 POWER AMPLIFIER. 2 X 200 W-RMS
Stereo DC power amplifier which is at the top of the new class A amplifier original with technics which canceled switching distortion and crossover distortion.
DC amplifier stream composition which banished all capacitors from the input to the output is adopted.
A bootstrap cascode and a Current-mirror load intensity are added to the differential amplifier of a one chip Dual FET with which the temperature characteristic was equal to the first rank,Then, it has the composition that a differential-amplification double cascode, the voltage amplification stage of a Current-mirror load intensity, the two-step SEPP driver stage of a Class-A, a synchro bias circuit, PP driver of SLPT2 Para, and the output stage of DLPT4 Para come.
The output stage and the power-source part were unified and the concentrated power block which prevents electromagnetic induction is adopted.
The newly developed super audio capacitor (capacity of 22,000 micro F) is adopted as an electrolytic capacitor a total of both four ch(es).
As for this capacitor, compared with the former, an impedance of 12dB is improved at 7dB and 1MHz by the mid range.
DLPT (dual linear power transistor) of the twin structure which made SLPT of high fT 2 stone one puck of NPN and PNP is developed newly and carried in the output transistor. The current wave form which comes out from the power stage by this realized a property which finally becomes the same as the wave of a Class-A operation, and has improved especially the high region property greatly.
The busline of three-layer sandwich construction is adopted and the distorted occurrence by electromagnetic induction is minimized.
TECHNICS SB-E200 SPEAKERS SYSTEM AND SB-10000
EPA-500B + EPA-A501H. TORNARM SYSTEM